Constraints on the new particle in $Σ^+\to pμ^+μ^-$

Details Constraints on the new particle in $Σ^+\to pμ^+μ^-$ Constraints on the new particle in $Σ^+\to pμ^+μ^-$

2005-09-17

arxiv.org/abs/hep-ph/0509175v2

Phys.Lett. B632 (2006) 215-218

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 3 figures, 1 table, revised version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.10.056

The HyperCP collaboration has presented the branching ratio of $\Sigma^+\to p\mu^+\mu^-$ to be $(8.6^{+6.6}_{-5.4}\pm 5.5)\times 10^{-8}$ and suggested a new boson $P^0$ with a mass of $214.3\pm 0.5$ MeV to induce the flavor changing transition of $s\to d\mu^+\mu^-$. We demonstrate that to explain the data, the new particle cannot be a scalar but pseudoscalar based on the direct constraints from $K^+\to\pi^+\mu^+\mu^-$ and $K_L\to\mu^+\mu^-$, respectively. Moreover, we determine that the decay width of the pseudoscalar should be in the range of $10^{-7}$ MeV with the lifetime of $10^{-14}$ sec.

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